8740, 8741 DC/DC displacement transducers

Inductive, for the measuring of displacements or magnitudes that can be converted into displacement, integral measuring amplifier, robust, vibration and shockproof, special versions by request

  • Features

    • Measurement ranges 0 ... 1 mm to 0 ... 150 mm
    • Non-linearity ± 0.25 % F.S., optional to 0.1 % F.S.
    • Integrated measuring amplifier, output 0 ... 5 V
    • Optional 0 ... 10 V, 4 ... 20 mA
    • Potted electronics not susceptible to vibration or impact
    • Special versions on request (see options)
  • Product data

    Model 8740, 8741
    Principle Inductive
    Measuring range

    8740
    0 … 1 mm
    0 … 2 mm
    0 … 5 mm
    0 … 10 mm
    0 … 25 mm
    0 … 50 mm
    0 … 100 mm
    0 … 150 mm

    8741
    0 … 1 mm
    0 … 2 mm
    0 … 5 mm
    0 … 10 mm
    0 … 25 mm
    0 … 50 mm

    Signal output

    0 ... 10 V
    0 ... 5 V
    ±5 V
    4 ... 20 mA
    10 ... 0 V
    5 ... 0 V

    Protection class

    8740
    IP64

    8741
    IP60

    Range of operating temperature -20 ... +80 °C
    Excitation voltage 9 ... 28 VDC
    Electrical connection

    8740
    3 wire, screened PVC cable 2 m

    8741
    7 pins plug connection

    Return spring

    8740
    No

    8741
    Yes

    Specific characteristics
    • Optional non-linearity 0.1 % F.S.
    • Integrated measuring amplifier, output 0 ... 5 
    • Optional 0 ... 10 V, 4 ... 20 mA
    • Potted electronics not susceptible to vibration or impact
    • Special versions on request (see options)

    8741

    • USB interface through 9206
  • Description

    Inductive displacement sensors using the principle of the differential transformer (LVDT) can be used to measure displacement and, indirectly, magnitudes that can be converted into displacements such as force, pressure, strain, torque, vibration and so forth.

    Thanks to the high quality of their measurements, their high protection and long service life, these sensors are used in many technologies (industry, research, development, etc.).

    Applications include measuring, controlling, regulating and monitoring both slow and fast movements between machine parts, measurements of position and positional changes of components and structural foundations, servo regulators, valve and robot controllers, growth measurements and so on.

    Their design is robust - the internal coils and electronics are potted - as a result of which the sensors can easily withstand shock and vibration. This makes the sensors also suitable for mobile applications (e.g. in vehicles) and for test installations where they will be subject to many test cycles.

    These inductive displacement sensors with integrated electronics incorporate a differential transformer and a carrier frequency measuring amplifier, potted and protected by a stainless steel housing.

    The differential transformer consists of one primary winding and two secondary windings; these are arranged symmetrically on either side of the primary winding. The integrated electronics demodulates, filters and amplifies the AC voltage induced in the secondary windings. A rod-shaped core is able to move inside the differential transformer. As an output, the sensor delivers a DC voltage whose magnitude proportionally depends on the position of the moveable core inside the sensor.

    Model 8740 incorporates a freely moveable, non-sprung core with two sliding Teflon rings that center the core in the hole through the body of the sensor. At the end of the moving rod is an M2 thread that can be used to couple the core mechanically to the object being measured. Any lateral force acting on the rod should be avoided.

    The moveable rod of model 8741 is mounted on ball bearings. A spring holds the tip of the probe against the object being measured. This version is advantageous when it is difficult or entirely impractical to implement a mechanical coupling. Once again, lateral forces will shorten the service life. The measuring side of the sensor is protected against pollution and splash water by a bellows.

  • Data Sheet & Downloads

    Data sheet
    Operation manual
  • Accessories

    pdf Sensor holder
    pdf Sensor fixing bracket
    pdf M24 threaded sleeve
    pdf Probe tips

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